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JPS5515849

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DESCRIPTION JPS5515849
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional front view of an ultrasonic
microphone according to an embodiment of the present invention, FIG. 2 is an exploded
perspective view thereof, FIG. 3 is a front view of the main parts thereof, and FIG. It is a
frequency characteristic view of the same microphone. 4 · · · Piezoelectric element, 5 · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · weight.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
microphone using a piezoelectric element, and is intended to be able to easily adjust the
frequency. Generally, the frequency adjustment of the ultrasonic microphone using the
piezoelectric element is performed by cutting the angle when the piezoelectric element is a
square plate and the outer diameter in the case of a single disk. However, this method is delicate
in adjustment, and it is very difficult to make many accurate adjustments. In addition, in the
structure in which a resonance plate or the like is adopted for the piezoelectric element, there is
also a means for cutting the coupling shaft or the like on which the resonance plate is attached
and shortening the length. -The wave number can be changed (adjusted) only in the higher one,
and there is a variation between the cutting size and the frequency change due to the
relationship between the dimensions of each part and the coupling state, and accurate
adjustment is difficult. The present invention is intended to eliminate the above-mentioned
conventional drawbacks, and to enable accurate frequency adjustment with a simple operation.
An embodiment of the present invention will be described with reference to the drawings. . 1 and
2 are a sectional side view and an exploded perspective view of an ultrasonic microphone having
a frequency adjusting means according to the present invention, in which 5 is a terminal having a
ring-shaped projection 2 of an arbitrary size at the center of the upper surface. A plate 4 is a
disc-like piezoelectric element adhered and supported by the elastic adhesive 3 to the projection
2 of the terminal plate 1. A through hole 6 formed at the center of the piezoelectric element 4 is
projected upward for bonding 7 is a metallic conical resonance plate fixed via the coupling shaft
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6, 8 is a shield plate attached to the lower surface of the terminal plate 3, 9 is a terminal, 10 is a
case, 11 is a case A net provided at the opening of 1 o, 12 is attached to the coupling shaft. Weights for frequency adjustment attached. In addition, piezoelectric-1) 3-element 4 is
configured by bonding two disk-shaped ceramic vibrators, the polarization directions thereof are
directions opposite to each other, and the vibration is a flexural vibration. . In the abovementioned microphone, when the length and mass of the connecting shaft 5 attached to the
central portion of the piezoelectric element 4 are changed, the frequency characteristic can be
changed. FIG. 4 is a diagram showing the change of the center frequency fO when the position
(position from the surface of the piezoelectric element) of the weight 12 attached to the
connection shaft 6 is changed, as can be seen from the figure. The frequency can be changed by
changing the relative position of the weight 12. The present invention adjusts the frequency by
changing the position of the weight attached to the coupling shaft 6 inserted and fixed to the
central portion of the piezoelectric element in this manner, and the relative position change of
the weight with the piezoelectric element is performed. Because the frequency change is small,
very accurate frequency adjustment is possible.
Also, this means is capable of providing continuous frequency and change as compared with the
conventional frequency adjustment by cutting the coupling axis, and because the mass of the
coupling axis and the entire weight of the weight is not changed. It is possible to supply an
ultrasonic microphone with superior productivity and performance compared to the conventional
means, such as adjustment can be made to both sides at high and low frequencies, and it can be
easily restored to the original value. In addition, the weight attached to the coupling axis changes
the weight of the weight → し weight, and the frequency can be further changed.
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